Study on Influcing Factors for Reduction Capacity of Gray-Green Sandstone in Ordos Sandstone-type Uranium Deposits

Li-juan ZHANG; Shu-qing AN; Tie-min XU; Nan ZHANG; Shuang WEI; Peng-da FANG

doi:10.15898/j.cnki.11-2131/td.201712180194

Rock and Mineral Analysis > 2018 > 37(4): 396-403. > DOI: 10.15898/j.cnki.11-2131/td.201712180194

Li-juan ZHANG, Shu-qing AN, Tie-min XU, Nan ZHANG, Shuang WEI, Peng-da FANG. Study on Influcing Factors for Reduction Capacity of Gray-Green Sandstone in Ordos Sandstone-type Uranium Deposits[J]. Rock and Mineral Analysis, 2018, 37(4): 396-403. DOI: 10.15898/j.cnki.11-2131/td.201712180194

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Study on Influcing Factors for Reduction Capacity of Gray-Green Sandstone in Ordos Sandstone-type Uranium Deposits

Tianjin Geological Survey Center, China Geological Survey, Tianjin 300170, China

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Received Date: December 17, 2017
Revised Date: June 03, 2018
Accepted Date: June 10, 2018
Published Date: June 30, 2018

Abstract

HIGHLIGHTS
(1) The reduction factors of U(Ⅵ) in sandstone-type uranium deposits in Ordos area were comprehensively studied.

(2) The common reducing agents (ferric ion, sulfide ion, pyrite, ilmenite, humic acid, methane gas and hydrogen gas) in sandstone-type uranium deposits were studied for the influence on the reduction capacity of U(Ⅵ).

(3) The immersion experiment showed that the gray-green sandstone contained ferrous ions that can reduce U(Ⅵ).

ABSTRACT

BACKGROUNDThe reductive environment of uranium is the most important influencing factor of uranium mineralization. The study of various redox markers in interlayer oxidation bands is of great significance for finding interlayer oxidation zone sandstone-type uranium deposits.
OBJECTIVESThe reduction experiments were carried out on reducing materials commonly found in sandstone-type uranium deposits such as ferrous, sulfide, pyrite, ilmenite, humic acid, biogas, and hydrogen. The reduction capacity of ferrous ion, sulfur ion, pyrite and other reduction factors at room temperature and pressure was studied.
METHODSBy polarography and spectrophotometry experiments to determine U(Ⅵ) and U(Ⅳ) content respectively. Their reduction capacity was analyzed.
RESULTSIron ion and sulfur ion had strong reducing properties, andhumic acid had certain reducing properties. Such as pyrite, ilmenite experiment in different acidity and sage green sandstone water soaking experiments showed that the soaked solution of gray-green sandstone contained a certain amount of ferrous ions, and there was no sulfur ion.
CONCLUSIONSThese ferrous ions were the main reason for the strong reducibility of gray-green sandstone. It also indicated that the gray-green sandstone was one of the most important factors in the subsequent mineralization of sandstone type uranium deposit in Ordos area.
- sandstone-type uranium deposits,
- reduction markers,
- gray-green sandstone,
- ferrous ions

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Study on Influcing Factors for Reduction Capacity of Gray-Green Sandstone in Ordos Sandstone-type Uranium Deposits

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